ISO 1920-4-2020 混凝土的试验--第4部分:硬化混凝土的强度 Testing of concrete — Part 4: Strength of hardened concrete

This document specifies procedures for testing the strength of hardened concrete.nd edition 2020-01 Testing of concrete — Part 4: Strength of hardened concrete Essais du béton — Partie 4: Résistance du béton durci Reference number ISO 1920-4:2020(E) ？ ISO 2020 ISO 1920-4:2020(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this